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          <h1 class="post-title" itemprop="name headline">前端面试必考篇—HTTP</h1>
        

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        <ol>
<li>HTTP 状态码知道哪些？</li>
<li>301 和 302 的区别是什么？<ol>
<li>301 永久重定向，浏览器会记住</li>
<li>302 临时重定向</li>
</ol>
</li>
<li>HTTP 缓存怎么做？<ol>
<li>Cache-Control: max-age=300</li>
<li><a href="http://cdn.com/1.js?v=1" target="_blank" rel="noopener">http://cdn.com/1.js?v=14</a> 避开缓存</li>
</ol>
</li>
<li>Cache-Control 和 Etag 的区别是什么？</li>
<li>Cookie 是什么？Session 是什么？<ul>
<li>Cookie<ol>
<li>HTTP响应通过 Set-Cookie 设置 Cookie</li>
<li>浏览器访问指定域名是必须带上 Cookie 作为 Request Header</li>
<li>Cookie 一般用来记录用户信息</li>
</ol>
</li>
<li>Session<ol>
<li>Session 是服务器端的内存（数据）</li>
<li>Session 一般通过在 Cookie 里记录 SessionID 实现</li>
<li>SessionID 一般是随机数</li>
</ol>
</li>
</ul>
</li>
<li>LocalStorage 和 Cookie 的区别是什么？<ol>
<li>Cookie 会随请求被发到服务器上，而 LocalStorage 不会</li>
<li>Cookie 大小一般4k以下，LocalStorage 一般5Mb 左右</li>
</ol>
</li>
<li>（必考）GET 和 POST 的区别是什么？<ol>
<li>参数。GET 的参数放在 url 的查询参数里，POST 的参数（数据）放在请求消息体里。</li>
<li>安全（扯淡）。GET 没有 POST 安全（都不安全）</li>
<li>GET 的参数（url查询参数）有长度限制，一般是 1024 个字符。POST 的参数（数据）没有长度限制（扯淡，4~10Mb 限制）</li>
<li>包。GET 请求只需要发一个包，POST 请求需要发两个以上包（因为 POST 有消息体）（扯淡，GET 也可以用消息体）</li>
<li>GET 用来读数据，POST 用来写数据，POST 不幂等（幂等的意思就是不管发多少次请求，结果都一样。）</li>
</ol>
</li>
<li>（必考）怎么跨域？JSONP 是什么？CORS 是什么？postMessage 是什么？<ol>
<li>JSONP</li>
<li>CORS</li>
<li>postMessage 看一下 MDN</li>
</ol>
</li>
</ol>
<h2 id=""><a href="#" class="headerlink" title=""></a><a href="https://github.com/Jsmond2016/blog/blob/master/%E5%B7%B2%E5%AE%8C%E6%88%90/%E9%9D%A2%E8%AF%95%E7%BB%BC%E5%90%88/%E5%89%8D%E7%AB%AF%E9%9D%A2%E8%AF%95%E5%BF%85%E8%80%83%E9%A2%98.md#vue" target="_blank" rel="noopener"></a></h2>
      
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